From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.5 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 19634C4338F for ; Sun, 15 Aug 2021 00:15:02 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id F061E60F21 for ; Sun, 15 Aug 2021 00:15:01 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234983AbhHOAP2 (ORCPT ); Sat, 14 Aug 2021 20:15:28 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]:39067 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235147AbhHOAPQ (ORCPT ); Sat, 14 Aug 2021 20:15:16 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1628986487; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=WmO12IyDy5qzS+T4IY7K2Y+LJ28N9E7M0ofJOxtqPww=; b=dX68h4rbliuiuB33xbxFtF1BpDC1QzSSU9/NRR9UaJKTFmkwDwHOki377w+dSDPzkv9k4j 2Zh2fplf5zSgXw6jqTM9pJVbpDfunMRts3iew3SMvKgtnTpfpBKRHB7m8VZkso/QOQn7v/ FY4eeXwXrQpKOkzHaiUHbfYDv48AUlY= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-452-9WEdRhYoN1KUkZXSz3d9ug-1; Sat, 14 Aug 2021 20:14:45 -0400 X-MC-Unique: 9WEdRhYoN1KUkZXSz3d9ug-1 Received: from smtp.corp.redhat.com (int-mx07.intmail.prod.int.phx2.redhat.com [10.5.11.22]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 7438B1008068; Sun, 15 Aug 2021 00:14:44 +0000 (UTC) Received: from gshan.redhat.com (vpn2-54-103.bne.redhat.com [10.64.54.103]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 07F211036D2E; Sun, 15 Aug 2021 00:14:40 +0000 (UTC) From: Gavin Shan To: kvmarm@lists.cs.columbia.edu Cc: linux-kernel@vger.kernel.org, james.morse@arm.com, mark.rutland@arm.com, Jonathan.Cameron@huawei.com, will@kernel.org, maz@kernel.org, pbonzini@redhat.com Subject: [PATCH v4 06/21] KVM: arm64: Support SDEI_EVENT_CONTEXT hypercall Date: Sun, 15 Aug 2021 08:13:37 +0800 Message-Id: <20210815001352.81927-7-gshan@redhat.com> In-Reply-To: <20210815001352.81927-1-gshan@redhat.com> References: <20210815001352.81927-1-gshan@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 2.84 on 10.5.11.22 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This supports SDEI_EVENT_CONTEXT hypercall. It's used by the guest to retrieved the original registers (R0 - R17) in its SDEI event handler. Those registers can be corrupted during the SDEI event delivery. Signed-off-by: Gavin Shan --- arch/arm64/kvm/sdei.c | 40 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 40 insertions(+) diff --git a/arch/arm64/kvm/sdei.c b/arch/arm64/kvm/sdei.c index b022ce0a202b..b4162efda470 100644 --- a/arch/arm64/kvm/sdei.c +++ b/arch/arm64/kvm/sdei.c @@ -270,6 +270,44 @@ static unsigned long kvm_sdei_hypercall_enable(struct kvm_vcpu *vcpu, return ret; } +static unsigned long kvm_sdei_hypercall_context(struct kvm_vcpu *vcpu) +{ + struct kvm *kvm = vcpu->kvm; + struct kvm_sdei_kvm *ksdei = kvm->arch.sdei; + struct kvm_sdei_vcpu *vsdei = vcpu->arch.sdei; + struct kvm_sdei_vcpu_regs *regs; + unsigned long index = smccc_get_arg1(vcpu); + unsigned long ret = SDEI_SUCCESS; + + /* Sanity check */ + if (!(ksdei && vsdei)) { + ret = SDEI_NOT_SUPPORTED; + goto out; + } + + if (index > ARRAY_SIZE(vsdei->state.critical_regs.regs)) { + ret = SDEI_INVALID_PARAMETERS; + goto out; + } + + /* Check if the pending event exists */ + spin_lock(&vsdei->lock); + if (!(vsdei->critical_event || vsdei->normal_event)) { + ret = SDEI_DENIED; + goto unlock; + } + + /* Fetch the requested register */ + regs = vsdei->critical_event ? &vsdei->state.critical_regs : + &vsdei->state.normal_regs; + ret = regs->regs[index]; + +unlock: + spin_unlock(&vsdei->lock); +out: + return ret; +} + int kvm_sdei_hypercall(struct kvm_vcpu *vcpu) { u32 func = smccc_get_function(vcpu); @@ -290,6 +328,8 @@ int kvm_sdei_hypercall(struct kvm_vcpu *vcpu) ret = kvm_sdei_hypercall_enable(vcpu, false); break; case SDEI_1_0_FN_SDEI_EVENT_CONTEXT: + ret = kvm_sdei_hypercall_context(vcpu); + break; case SDEI_1_0_FN_SDEI_EVENT_COMPLETE: case SDEI_1_0_FN_SDEI_EVENT_COMPLETE_AND_RESUME: case SDEI_1_0_FN_SDEI_EVENT_UNREGISTER: -- 2.23.0